WO2018068119A1 - Use of a compound, pharmaceutical composition, and therapeutic method for the treatment or prevention of convulsions - Google Patents

Abstract

The present invention relates to the fields of chemistry, pharmacy, biotechnology and medicine. More particularly, the present invention describes: the use of a peptide compound for preparing an anticonvulsant drug; an anticonvulsant pharmaceutical composition; and a therapeutic method. The peptide compound of the claimed pharmaceutical composition binds to and/or modulates the activity of cannabinoid (CB) receptors, particularly CB1 and/or CB2, and has proven to be extremely useful as an anticonvulsant. In one embodiment, the claimed pharmaceutical composition provides excellent anticonvulsant results when administered orally to a mammal, and, in addition to other advantages and technical effects, does not entail the drawbacks arising from the use of cannabinoid substances such as cannabidiol, and provides a stronger therapeutic effect in a smaller dosage and with fewer side effects.

Description

 Patent Specification Report

 Use of Compound, Pharmaceutical Composition, and Therapeutic or Curative Therapeutic Method of Seizures

Field of the Invention

 The present invention is in the fields of pharmacy, medicine, chemistry and biotechnology. More specifically, the present invention describes the use of hemopressin and variants with more than 7 amino acids to prepare an anticonvulsant pharmaceutical composition; an anticonvulsive pharmaceutical composition; and a therapeutic method. The anticonvulsive pharmaceutical composition of the invention may be administered orally. In one embodiment, oral administration of the composition of the invention demonstrated significant and surprising results in the curative or prophylactic treatment of seizures. Test results show that administration of the compound of the invention provides for the interaction and / or modulation of muscarinic and / or cannabinoid (CB) receptor activity, especially CB1 and / or CB2, the pharmaceutical composition of the invention being a promising alternative to administration of cannabinoid compounds currently known as anticonvulsants, such as, for example, cannabidiol.

Background of the Invention

 The present invention describes for the first time the use of a peptidic compound including Hemopressin for the preparation of anticonvulsive pharmaceutical compositions.

 Surprisingly, although the pharmaceutical composition of the invention comprises a peptide active, oral administration has provided brain effects in animals.

In various embodiments, in vivo tests with the pharmaceutical composition of the invention have shown surprising results regarding its anticonvulsant activity, and in addition it provides the advantage of being a good candidate to substitute the cannabinoid compounds known as anticonvulsants, such as Canabidiol. Cannabidiol, despite its proven effects as an anticonvulsant, has been facing regulatory problems due to its origin, the Cannabis sativa plant. The present invention provides an additional therapeutic approach for patients suffering from seizures and having difficulty in obtaining drugs, being based on a peptide and not using Cannabis sativa derivatives. In addition, the results showed that the anticonvulsant of the invention provides other surprising technical advantages in use, including greater therapeutic effect, oral use, lower dosage, less occurrence of side effects such as prostration and nasal bleeding, among other technical advantages.

 Pilocarpine (commonly called "Pilo") is an alkaloid extracted from leaves of the jaborandi (Pilocarpus jaborandi) plant, a plant used for centuries by the Tupi-Guarani Indians who inhabit Brazil and take advantage of their properties of producing sour and saliva . Pilocarpine is a nonspecific muscarinic agonist, slowly degraded and without effects on nicotinic receptors and was introduced in clinical practice by the Brazilian physician Sifrônio Coutinho, in 1874, through extracts from the jaborandi leaf to obtain a diaphoretic effect (sweat production) and silagogue (production of saliva).

Despite its pharmaceutical properties, pilocarpine at high concentrations induces the occurrence of convulsions, being used as an experimental model! therefore. Pilocarpine-induced seizures lead to neurotoxicity at the cellular level and may be related to increased cerebral oxidative stress and changes in the concentration of certain amino acids (Santos et al, 201 1).

Administration of pilocarpine causes cholinergic changes capable of inducing status epilepticus (SE) associated with convulsive stereotyped movements. Pilo is able to induce epilepticus status both administered directly in the brain and intraperitoneally. This substance has been used in some experiments described in this patent application, its convulsive effects having been inhibited by the composition of the present invention. [0008] Much of the understanding of the mechanisms of epilepsy comes from studies in experimental animal models, especially in rats and mice. In this context, the administration of pilocarpine in rodents mimics epilepsy (ELT) in humans and is generally referred to as the "pilocarpine model". This model was developed in 1983 by Turski et al., And is now one of the most widely used models of epilepsy, considering that its histological, biochemical, pharmacological, electrophysiological and behavioral characteristics (Turski et al., 1983) similarly reproduce those found in human carriers of ELT.

The pilocarpine model is also useful for evidence of changes in muscarinic receptors, such as salivation. Acetylcholine, through its muscarinic receptor (mAChRs) plays an important role in cognitive functions, such as learning and memory. MAChRs are receptors that form G protein-receptor complexes on the cell membranes of certain neurons and other cells. They play several roles, including acting as the ultimate end receptor stimulated by acetylcholine released from postganglionic fibers in the parasympathetic nervous system.

 Muscarinic receptors are so called because they are more sensitive to muscarin than to nicotine. Its counterparts are nicotinic acetylcholine receptors (nAChRs), channels of receptor ions that are also important in the autonomic nervous system. Many drugs and other substances (eg, pilocarpine and scopolamine) manipulate these two distinct receptors acting as selective agonists or antagonists.

The mAChRs are among the most well characterized among the transmembrane receptors (7TM), being widely expressed in the central nervous system (CNS). Five mAChR subtypes were cloned (M1, M2, M3, M4 and M5) and are generally divided into two distinct classes based on signal transduction. mAChR M1, M3 and M5 are subtypes that signal through Gq / 11 proteins and activate phospholipase-C and mobilize intracellular calcium. The mAChR M2 and M4, however, predominate through Gi / o proteins inhibiting adenylate cyclase and reducing the intracellular concentration of cAMP. The predominant mAChR in the CNS is the M1 subtype, which is located in the cortex, hippocampus, striatum and thalamus, where it is found post-synaptic. The M2 mAChRs are located predominantly in the brainstem and thalamus, but also in the cortex, hippocampus and striatum, where they control the release of acetylcholine. The MAChRs of M3 and M5 are expressed at much lower levels than Mh or Mh MAChRs in the CNS, but Mh MAChRs are found in the cortex and hippocampus, while M5 mAChRs have a very discrete location in the substantia nigra. Mh MAChR are found in many regions of the brain, including the cortex and hippocampus, but are more prominent in the striatum, where they are thought to play a role in controlling dopamine release and modulate locomotor activity.

The test results presented in the present application indicate that the composition of the invention interacts with cannabinoid receptors and / or muscarinic receptors. The results show that the compound of the invention is anticonvulsive.

 Experimental data indicate that the active compound of the invention interacts with and / or modulates the activity of cannabinoid (CB) receptors. The cannabinoid system, which comprises the CB1 and CB2 receptors and their endogenous ligands, acts on various metabolic functions, including control of food intake and energy metabolism, among others. Cannabinoid receptors are widely expressed in the brain, including the cortex, hippocampus, amygdala, pituitary, and hypothalamus. CB receptors, particularly CB1, have already been identified in numerous peripheral organs and tissues, including the thyroid gland, adrenal gland, reproductive organs, adipose tissue, liver, muscle, and gastrointestinal tract.

Several compounds have already been detected in the art having modulation activity of these receptors. Among these, some target the development of drugs for weight reduction and thinning of the waist, such as rimonabant. However, this compound was subsequently associated with the increased occurrence of psychiatric diseases in humans and has been removed from the world market.

 Background searches have disclosed only partially relevant documents for the present invention. Such documents will be described below, and are set forth herein solely for the purpose of serving as a basis for the state of the art, since none of them anticipate or even suggest any of the objects of the present invention.

US 2007/213302 discloses CB1 receptor interaction compounds, consisting of pyrazoles and their pharmaceutically acceptable salts which act as antagonists or inverse agonists of the CB1 receptor. The present invention differs from said document, among other reasons, because it has a pharmaceutical composition which does not comprise pyrazoles or salts thereof, the results of which are surprising in inhibiting the occurrence of seizures, facts not described or suggested in said document.

 Some studies presented by one of the present inventors in Novel Novel Peptide Substrates for Endopeptidase 24.15 Neurolysin and Angiotensin Converting Enzyme (Vanessa Rioli, Fabio C. Gozzo, Andrea S. Heimann, Alessandra Linardi, Joseph E. Krieger, Cláudio S. Shida, Paulo C. Almeida, Stephen Hyslop, Marcos N. Eberlin, Emer S. Ferro, March 7, 2003) demonstrate an effective technique of "screening" of new peptides. The present invention differs from this document, among other reasons, because it presents a novel therapeutic approach to convulsions, the results of which have been surprising.

WO 2014/008567, one of the present inventors, discloses compounds and compositions useful for treating metabolic disorders comprising obesity, diabetes, systemic arterial hypertension (or disease, condition related and / or associated comorbidities); prevention of overweight; regulation of appetite; induction of satiety; prevention of weight gain after successful weight loss; increased energy consumption; aesthetic weight reduction; or bulimia. No report or suggestion of use of the compound of the invention as an anticonvulsant is made in said document, because this approach was not imagined by the inventors nor was it obvious from the state of the art.

 WO 201 01/01187 discloses the use of hemopressin for the treatment of obesity in a subject and further discloses that hemopressin is a compound that binds effectively to the CB1 receptor. The present invention differs from said document, among other reasons, by providing a composition for another therapeutic use, in addition to revealing for the first time the surprising anticonvulsant activity.

WO 2013/021 196 discloses the use of hemopressin as an agent that interferes with oligodentine differentiation and is useful as an anti-demyelinating agent. The present invention differs from said document, among other reasons, in that it reveals another use. Test results performed by the inventors have been surprising in regard to inhibition of seizures, which is neither described nor suggested in said document.

 Other references of scientific literature circumscribing the invention, but without anticipating or suggesting it, include the following documents.

[0022] ASPRONI, B. et al. Novel pyrrolocycloalkylpyrazole analogues as CB1 ligands. Chemical Biology and Drug Design, p. 1 -13, 2017.

HILDEBRANDT, A. K. et al. Efficient computation of root mean square deviations under rigid transformations. Journal of Computational Chemistry, v. 35, p. 765-771, 2014.

 [0024] HUA T. et al. Crystal structure of the human cannabinoid CB1 receptor. Celi, v. 167, p. 750-762, 2016.

 [0025] MAIOROV, V. N .; CRIPPEN, G. M. Significance of root-mean-square deviation in comparing three-dimensional structures of globular proteins. Journal of Molecular Biology, v. 235, p. 625-634, 1994.

[0026] MORGAN, CA; HURLEY, TD Characterization of two distinct structural classes of selective aldehyde dehydrogenase 1 A1 inhibitors. Journal of Medicinal Chemistry, v. 58, p. 1964-1975, 2015. [0027] PERTWEE, RG The diverse CB1 and CB2 receptor pharmacology of three plant cannabinoids: A9-tetrahydrocannabinol, cannabidiol and Δ9-tetrahydrocannabivarin. British Journal of Pharmacology, v. 153, p. 199-215, 2008.

 [0028] RAMACHANDRAN, G. N .; RAMAKRISHNAN, C; SASISEKHARAN, V. Stereochemistry of polypeptide chain configurations. Journal of Molecular Biology, v. 7, p. 95-99, 1963.

 [0029] SANTOS, P. S. et al. Effects of lipoic acid on glutamate and taurine concentrations in rat hippocampus after pilocarpine-induced seizures. Arq. Neuro-Psiquiatr. [online]. 201 1, vol.69, n.2b, pp.360-364. .

[0030] MUNRO et al. Nature 365: 61-65, 1993.

 [0031] RINALDI-CARMONA M. et al. J. Pharmacol. Exp. Ther. 278: 871-878, 1996. [Medline]

 [0032] Langmead CJ1, Watson J, Reavill C. Muscarinic acetylcholine receptors as CNS drug targets. Pharmacol Ther. 2008 Feb; 17 (2): 232-43. Epub 2007 Dec 20.

 From the literature, no documents were found anticipating or suggesting the teachings of the present invention, let alone their surprising technical effects, so that the solution proposed here, in the eyes of the inventors, has novelty and inventive step to the state of the art.

Summary of the Invention

 The present invention addresses a major problem known in the art by providing: the use of a peptidic compound to prepare anticonvulsant medicament; an anticonvulsive pharmaceutical composition; a therapeutic method. The pharmaceutical composition of the invention does not have the drawbacks arising from the use of the cannabinoid substances, such as prostration and / or nasal bleeding, among others.

One of the objects of the present invention is the use of a peptide compound of at least 7 amino acids of the formula: R ₁ -N-AA ₁ -K-AA ₂ -R ₂

at where:

AAi is an amino acid selected from the group consisting of F, W, L, I, V, P, G; AA ₂ is an amino acid selected from the group consisting of F, W, L, I, V, P, G; Ri is the dipeptide PV, the tripeptide DPV, the tetrapeptide VDPV, or the pentapeptide RVDPV; and

R ₂ is the amino acid L, the dipeptide LH, or the tripeptide LSH,

and / or modified, cyclic forms thereof, amidated, methylated,

PEGylated, their salts; and / or combinations thereof,

for the preparation of a medicament for the curative or prophylactic treatment of seizures in a mammal.

In one embodiment, AA ₁ and / or AA ₂ is F, W, or L.

It is a further object of the invention to provide a substitutable compound to cannabidiol and which provides advantages in the production, handling, use and safety and can replace it in all or almost all applications already described therefor.

 It is another object of the invention to provide a compound useful for modulating muscarinic receptors and / or the cannabinoid system, either by modulating the CB1 receptor, the CB2 receptor, both concurrently by modulating the binding or action of other substances which interact in the cannabinoid system by the modulation of proteases or peptidases that lead to the generation or degradation of active peptides in the cannabinoid system, or combinations thereof.

 Another object of the invention is a pharmaceutical composition for the curative or prophylactic treatment of seizures in a mammal, said composition comprising a pharmaceutically acceptable carrier; and, as active principle, the compound described above.

Embodiments of pharmaceutical composition of the invention include one or more peptides selected from the group consisting of: DPVNFKL, DPVNFKF, PVNFKFL PVNFKLL, PVNFKLS, PVNFKLLS, PVNFKLSH, PVNFKLLSH, VDPVNFKFLSH, RVDPVNFKFLSH, VDPVNFKFLSH, VDPVNFKLLSH, VDPVNFKL, VDPVNFKF, PVNWKFLSH, PVNFKWLSH, PVNWKWLSH, PVNWKFL, PVNFKWL, PVNWKWL, as well as modified, cyclic forms thereof, amidated, methylated, PEGylated versions; their salts; or combinations thereof.

 In one embodiment, the anticonvulsant pharmaceutical composition of the invention comprises the nonapeptide PVNFKFLSH, the nonapeptide

PVNFKLLSH, or combinations thereof.

 In one embodiment, the pharmaceutical composition is in the form of a tablet, gel, oral liquid or syrup, capsule, suppository, injectable solution or inhalable or adhesive forms, and may optionally comprise other active principles.

 Administration of the pharmaceutical composition of the invention to an animal provides important and surprising technical advantages, including: anticonvulsant activity; enables oral administration in animals; does not have or entails the drawbacks arising from the production, storage, transport and use of cannabinoid substances, in addition to providing additional advantages in the preparation of therapeutic products for mammals in their administration and / or effects.

 Another object of the present invention is a curative or prophylactic therapeutic method of seizures comprising administering to an animal the compound as described above.

 These and other objects of the present application will be immediately appreciated by those skilled in the art and by companies having interests in the art and will be described in sufficient detail for their reproduction in the following description.

Brief Description of the Figures

The following detailed description and the accompanying figures illustrate the main features and embodiments of the present invention, set forth in detail to provide further support to the person skilled in the art and so that the same may understand and reproduce the inventive concept of the invention in any of its embodiments. Such details or figures are not to be construed as limiting and serve only to illustrate some of the embodiments of the present invention.

 Figure 1 shows the results of convulsive tests with the pilocarpine model, indicating the survival time of the animals after administration of pilocarpine and the test compounds in the assay. The peptide data of the invention PVNFKFLSH (or Hp) 1000 μg / kg shown is only one animal that died. Although data between control, Hp 600 μg / kg and DIIADDEPLT 1000 μg / kg (also referred to in this application as PEP-19) are not statistically significant, the Hp 1000 μg / kg data shown in the graph is just an animal that died. The remaining animals in the group treated with the anticonvulsant composition of the invention, totaling 4, were alive for more than a week, while all the others died in less than 20 minutes. Consequently, the mean survival time for this group is significantly different and higher than the others when Hp 1000 μg / kg is administered.

Figure 2 shows the results of tests with the anticonvulsant composition of the invention PVNFKFLSH (or Hp) on the pilocarpine model, indicating the number of animals killed in the group with n = 5. The asterisk ( ^* ) P <0.001 vs Control, Hp 600 μg / kg, Hp 1000 μg / kg, DIIADDEPLT 1000 μg / kg (Pep-19).

Figure 3 shows the test results with the anticonvulsant composition of the invention comprising the peptide PVNFKFLSH (or Hp) in the pilocarpine model, with the survival / death profile of the animals being indicated. In A) the survival profile of the animals to which the control was administered (saline only) is shown; In B) the survival profile of the animals given the DIIADDEPLT 1000μg / kg peptide (Pep-19) is shown; In C) the survival profile of the animals to which the anticonvulsant composition of the invention was administered comprising PVNFKFLSH (or Hp) 600μg / kg; In D) the survival profile of the animals to which the peptide of the invention was administered PVNFKLLSH (or Hp) 100C gg / kg; In E) all profiles are shown in a single graph.

Figure 4 shows the test results of the anticonvulsant composition of the invention comprising PVNFKFLSH (or Hp) in the pilocarpine model, the time for the occurrence of the first salivation being indicated. The asterisk ( ^* ) indicates P <0.01 vs DIIADDEPLT (100æg / kg, also referred to herein as PEP19 and used as another control).

 Figure 5 shows the test results of the anticonvulsant composition of the invention comprising PVNFKFLSH (or Hp) in the pilocarpine model, the time being indicated for the occurrence of the first convulsive frame signal.

Figure 6 shows the test results of the anticonvulsant composition of the invention comprising PVNFKFLSH (or Hp) in the pilocarpine model, indicating the time for the occurrence of the first seizure. The asterisk ( ^* ) indicates P <0.001 vs Control, Hp (600 μg / kg), peptide DIIADDEPLT (1000 μg / kg, used as another control).

Detailed Description of the Creation and Invention

 In the present invention, there is provided the use of the peptidic compound described below for the preparation of a medicament for the curative or prophylactic treatment of seizures. Peptides of the present invention include hemopressin, which for the first time surprisingly showed significant and long-lasting anticonvulsant effects.

In various embodiments, in vivo tests with the compound of the invention have shown surprising results regarding its anticonvulsant activity, further providing the advantage of being a good candidate to substitute the known cannabinoid compounds for their acting as anticonvulsants, as is the case with Canabidiol. Cannabidiol, despite its proven effects as an anticonvulsant, has been facing regulatory problems due to its origin, the Cannabis sativa plant. The present invention provides an additional therapeutic approach for the patients who suffer from seizures and who have difficulty obtaining medicines, being based on a peptide, that is, does not use derivatives of Cannabis sativa. In addition, the results showed that the anticonvulsant pharmaceutical composition of the invention provides other surprising technical advantages in use, including greater therapeutic effect, oral use, lower dosage, less occurrence of side effects such as prostration and nasal bleeding, among other technical advantages.

 The inventive concept common to the various objects of the invention is the use of a compound for the preparation of an anticonvulsant pharmaceutical composition, said compound comprising at least 7 amino acids of the formula:

R ₁ -N-AA ₁ -K-AA ₂ -R ₂

at where:

AA is an amino acid selected from the group consisting of F, W, L, I, V, P, G; AA ₂ is an amino acid selected from the group consisting of F, W, L, I, V, P, G; Ri is the dipeptide PV, the tripeptide DPV, the tetrapeptide VDPV, or the pentapeptide RVDPV; and

R ₂ is the amino acid L, the dipeptide LH, or the tripeptide LSH,

and / or modified, cyclic forms thereof, amidated, methylated,

PEGylated, their salts; and / or combinations thereof,

for the preparation of a medicament for the curative or prophylactic treatment of seizures in a mammal.

 [0056] Compound of pharmaceutical interest

In the context of the present application, "compound of pharmaceutical interest" means any molecular entity comprising the compound described as an inventive concept common to the present application, including also molecular entities obtained by chemical derivatization thereof, with the inclusion of other functional groups, linear or branched side chains, alteration of hydrophilicity or hydrophobicity, among others, provided that they comprise as nucleus entity R1-N-AA1-K-AA2-R2 as defined above, except for those natural and known entities.

[0058] Pharmaceutical composition

 In the context of the present patent application, "pharmaceutical composition" is to be understood as any and all compositions containing an active principle, for prophylactic, palliative and / or curative purposes, acting in a manner to maintain and / or restore the homeostasis, and may be administered orally, topically, parenterally, enterally and / or intrathecally.

[0060] Pharmaceutically acceptable formulation

 In the context of the present application a "pharmaceutically acceptable formulation" is meant a formulation containing pharmaceutically acceptable excipients and carriers well known to those skilled in the art, such as the development of convenient doses and treatments for use in particular compositions which can be described in a number of treatment regimens, including oral, parenteral, intravenous, intranasal, intravitreal and intramuscular, intracerebral, intracerebroventricular and intraocular and their administration and / or formulation.

[0062] Modified peptide

 In the context of the present application, "modified peptide" is to be understood as a non-naturally occurring, artificially modified or synthesized peptide, including cyclized, amidated, methylated, PEGylated, or salt forms thereof, as well as a peptide comprising one or more unnatural amino acid, such as d-amino acid forms. The peptidic compound may be pegylated using techniques known to those skilled in the art, such as, for example, pegylation with reagents containing the succinimidyl group, which preferentially react with primary amines present in the N-terminal region of the peptide.

[0064] Cyclic or circular peptide

In the context of the present application, "cyclic, cyclized or" circular peptide "is to be understood as a peptide which has a covalent bond between the two ends of a linear peptide molecule by any method known in the art, particularly by the activity of enzymes. The cyclic peptide can be used instead of the linear peptide due to the fact that it is more difficult to be degraded, since its ends or zones of attack by hydrolyzing enzymes are not as exposed as in a linear peptide.

[0066] Aqonista

 In the context of the present application, "agonist" is to be understood as a drug, drug, hormone, neurotransmitter or other signaling molecule which forms a complex with a receptor site, thereby triggering an active response of a cell.

[0068] Reverse Aqonist / antagonist

 In the context of the present application, "reverse agonist or antagonist" as agent (s) (eg drugs, drugs, hormones or enzymes) which binds to agonist receptors is produced and produces (in) pharmacological effects opposed to those of the agonists, such that the action of one partially or totally inhibits the effect of the other. Particularly, a compound is an inverse agonist when it acts in the presence of an agonist, but reducing its activity; an antagonist is a compound that will totally block the activity of the agonist.

[0070] Equivalent Dose in Humans

In the present invention, the concept of "equivalent dose in humans" is the dose at which, in humans, the same magnitude of effects observed in animals in a given dose is expected, as set forth in Guidance for Industry Estimating the Maximum Safe Starting Dose in Initial Clinical Trials for Therapeutics in Adult Healthy Volunteers "published by the US Department of Health and Human Services Food and Drug Administration Center for Drug Evaluation and Research (CDER), July 2005 Pharmacology and Toxicology. In said guide, the conversion of the dose observed in animals (mg / kg) to Equivalent Dose in Humans (mg / kg) implies dividing the result obtained in rats by 6.2 and the result obtained in mice by 12.3. These values apply to a human with 60 kg of standard weight. For other species or for weights outside the standard weight ranges, the Human Equivalent Dose (DEH) can be calculated by the formula: DEH = dose in animal in mg / kg x (animal weight in kg / human weight in kg) ^{0 33} . This Guidance considers a safety range of 10 times the concentration limits tested to be adequate.

 Modulating the CB receptor function or the cannabinoid system

In the context of the present application, it is meant to "modulate the CB receptor function" as an interaction that entails in altering the biochemical activity of the CB receptor, particularly CB1 or CB2. It is understood that the change is positive when an antagonist or inverse agonist effect occurs at CB receptors and that the change is negative when an agonist effect occurs at CB receptors. The tests presented in the present patent application suggest that the compound of the invention interacts with and / or modulates the CB1 receptor and / or the CB2 receptor, probably as an allosteric modulator of CB1 and / or CB2 receptor. Thus the compound of the invention is useful for modulating the cannabinoid system, either by modulating the CB1 receptor, the CB2 receptor, both concurrently, by modulating the binding or action of other substances interacting in the cannabinoid system, by modulating proteases or peptidases which lead to the generation or degradation of active peptides in the cannabinoid system, or combinations thereof.

Modulating the function of muscarinic receptors

In the context of the present application, the term "modulating muscarinic receptor function" should be understood as an interaction leading to neuronal changes, including muscarinic acetylcholine receptor (mAChRs), which plays an important role in cognitive functions, such as such as learning and memory, control of dopamine release, modulation of locomotor activity, its modulation being also useful in the control of Alzheimer's disease and / or control of addiction or addiction to drugs of abuse. It is understood that the change is positive when an antagonist or inverse agonist effect occurs at muscarinic receptors and that the change is negative when an agonist effect occurs at muscarinic receptors. The tests presented in the present patent application suggest that the compound of the invention interacts with and / or modulates muscarinic receptors.

Although in this invention it is shown that said compound binds and / or modulates cannabinoid receptors, the surprising pharmaceutical action of the invention may be linked to action on CB1 and / or CB2 and / or muscarinic or possibly linked to uptake modulation adenosine, GGPR55, PPARγ receptors, intracellular calcium level, or combinations thereof.

 The present invention is also defined by the following clauses.

Use of the compound described above for the preparation of a medicament for the curative or prophylactic treatment of seizures in a mammal.

[0079] Use as described above wherein AA or AA ₂ is F, W or L.

[0080] Use as described above wherein said compound is selected from the group consisting of: DPVNFKL, DPVNFKF, PVNFKFL PVNFKLL, PVNFKFLS, PVNFKLLS, PVNFKFLSH, PVNFKLLSH, VDPVNFKFLSH, RVDPVNFKFLSH, VDPVNFKFLSH, RVDPVNFKLLSH VDPVNFKL, VDPVNFKF, PVNWKFLSH, PVNFKWLSH, PVNWKWLSH, PVNWKFL, PVNFKWL, PVNWKWL, as well as modified, cyclic forms thereof, amidated, methylated, PEGylated versions; their salts; or combinations thereof.

 Use as described above wherein said compound is the nonapeptide PVNFKFLSH, the nonapeptide PVNFKLLSH, or combinations thereof.

 A pharmaceutical composition for the curative or prophylactic treatment of seizures in a mammal comprising a pharmaceutically acceptable carrier; and, as active principle, the compound described above.

Pharmaceutical composition as described above in the form of a tablet, gel, oral liquid or syrup, capsule, suppository, solution for injection, inhalable form or in adhesive. A curative or prophylactic therapeutic method of seizures comprising administering, to an animal, the compound described above.

In vivo tests in mammals showed excellent therapeutic effect at low dosages. The anticonvulsant effect is evidenced by the absence or decrease of symptoms associated with the administration of pilocarpine.

In addition, test results have shown that the composition of the invention provides surprising technical advantages in use, including greater therapeutic effect, viability of oral use, lack of use of carrier oil (which in many cases causes side effects), lower dosage and no occurrence of side effects such as prostration and nasal bleeding, among others.

 In the present invention, the use of the compound as described above for the preparation of a medicament for the curative or prophylactic treatment of seizures is provided for the first time.

In addition, as will be demonstrated in the following examples, the pharmaceutical composition of the invention provides for obtaining a medicament orally administrable to a mammal. The test results revealed significant brain action, suggesting that the active element crosses the blood-brain barrier. Thus, the results show / support the use of the compound of the invention regardless of whether the compound of the invention is the active which acts directly on the target, ie, does not degrade during oral ingestion, or the compound is a precursor which, upon modification chemistry, acts on the target - in this case, being characterized as a pro-drug. This feature of providing important effects even by oral administration is particularly desirable, since the natural enzymes of a mammal in general degrade peptides and proteins while in the digestive tract and rarely a drug with a peptidic active is shown to be viable. However, surprisingly, the compound of the invention - even when administered orally - provides strong therapeutic action, in this case even more surprisingly, acting in the brain. Therefore, regardless of the mechanism of action, which is not the subject of the present application, the fact that the oral administration of the pharmaceutical composition of the invention has provided important action and anticonvulsant, clearly shows the surprising magnitude and relevance of the problems resolved.

 The present application discloses a pharmaceutical composition comprising the compound described above. Said pharmaceutical composition also comprises a pharmaceutically acceptable carrier, optionally also comprising other pharmaceutically acceptable actives and / or salts thereof. The compound of the invention is one or an active component of the pharmaceutical composition of the invention, which is administered in the form of a tablet, gel, capsule, oral liquid or syrup, a suppository, an injectable solution or other suitable forms of administration for pharmaceutical and medical purposes.

The following examples are only intended to exemplify some of the various ways of achieving the invention, however, without limiting the scope thereof.

 In some examples, the anticonvulsive effects of the composition of the invention have been evaluated in vivo by oral administration to animals. The pharmaceutical composition of the invention was administered to mammals (Mus musculus or mouse) with oral dose of treatment, compared to other compounds or to saline control. In these experiments, the test compounds were administered orally 10 minutes prior to (intraperitoneal) administration of pilocarpine. Pilocarpine hydrochloride (320 mg / kg, Merck), dissolved in 0.9% sterile saline, was administered intraperitoneally for induction of SE (status epileticus) (Turski et al., 1983). In the Turski model, the neurotoxic effects begin about 15-25 minutes after the injection of Pilo, with the occurrence of motor and limbic seizures, the animals evolving to a state of continuous (clonic) seizures that characterize SE Sanabria and Cavalheiro, 2000).

Examples Example 1. Use of compound R-N-AA -K-AAg-Rg for the preparation of anticonvulsive pharmaceutical composition

In this embodiment, the compound R1-N-AA1-K-AA2-R2 is the peptide PVNFKFLSH, also known as hemopressin or Hp, which has been synthesized by chemical synthesis. Said peptide was used in the preparation of a liquid pharmaceutical anticonvulsant composition for oral use comprising 1, 5x10 ^"4 Molar said peptide and a pharmaceutically acceptable carrier. In this embodiment, said carrier is saline solution, the pharmaceutical composition being an oral solution Said composition was used for oral in vivo administration to mammals according to examples 1 and 3 below.

 In other embodiments, the pharmaceutical composition is in the form of a tablet, gel, oral liquid or syrup, capsule, suppository, injectable solution or inhalable or adhesive forms, optionally comprising other active principles.

 Example 2. Anticonvulsive pharmaceutical composition comprising compound PVNFKFLSH (Hp) - in vivo test results

 In this embodiment, the anticonvulsive effect of the composition of the invention prepared according to example 1 was evaluated by prior administration of the inventive composition and subsequent administration of pilocarpine to animals. Administration of pilocarpine leads to severe brain injury, neurotoxicity and usually culminates in the death of the animals. This substance was used in the experiments described below but its harmful neuronal / encephalic effects were inhibited by the prior administration of the composition of the present invention: the vast majority of the animals subjected to these experiments had no symptoms related to brain lesions and survived without apparent damage, in contrast to groups of animals treated with other known substances.

The composition of the invention prepared according to Example 1 was pre-administered to the animals. [0100] Figure 1 shows the survival time results of the animals after administration of pilocarpine and test compounds in the assay. The data relating to the anticonvulsant composition of the invention comprising PVNFKFLSH (or Hp) 1000 μg / kg presented is only one animal that died. Although the data between control, Hp 600 μg / kg and DIIADDEPLT 1000 μg / kg are not statistically significant, the data for Hp 1000 μg / kg shown in the graph is only one animal that died. The remaining animals in the group treated with the anticonvulsant composition of the invention invention for a total of 4 remained alive for more than a week, while all the others died in less than 20 minutes. Consequently, the mean survival time for this group is significantly different and higher than the others when Hp 1000 μg / kg is administered.

Figure 2 shows the results of seizure tests with the anticonvulsant composition of the invention comprising the PVNFKFLSH (or Hp) peptide in the pilocarpine model, indicating the number of animals killed in the group with n = 5. The asterisk ( ^* ) P <0.001 vs Control, Hp 600 μg / kg, Hp 1000 μg / kg, DIIADDEPLT 1000 μg / kg (Pep-19).

Figure 3 shows the results of seizure tests with the anticonvulsant composition of the invention comprising the peptide PVNFKFLSH (or Hp) in the pilocarpine model, indicating the survival / death profile of the animals. In A) the survival profile of the animals to which the control was administered (saline only) is shown; In B) the survival profile of the animals given the DIIADDEPLT 1000μg / kg peptide (Pep-19) is shown; In C) the survival profile of the animals given the PVNFKFLSH (or Hp) peptide 600μg / kg was shown; In D) the survival profile of animals given the PVNFKFLSH (or Hp) peptide 1000μg / kg; In E) all profiles are shown in a single graph. Among other technical advantages, the occurrence of typical side effects of other anticonvulsants, such as prostration and nasal bleeding, has not been observed.

 Example 3. Anticonvulsive pharmaceutical composition comprising compound PVNFKFLSH (Hp) - in vivo test results

 In this embodiment of the invention, the anticonvulsive composition of the invention in which the peptide R1-N-AA1-K-AA2-R2 is the nonapeptide PVNFKFLSH, was used for administration to mammals in the tests described below.

[4106] Figure 4 presents the results of tests with the pilocarpine model, indicating the time for the occurrence of the first salivation. The asterisk ( ^* ) indicates P <0.01 vs Pep19 100æg / kg.

 [0107] On the one hand, salivation induced by the administration of pilocarpine is indicative of changes in muscarinic receptors. Accordingly, the substantial change in the time profile for the occurrence of the first salivation observed with prior administration of the compound of the invention suggests modulation, either directly or indirectly, of muscarinic receptors.

 In addition, the results of Figure 4 clearly show that oral administration of the compound of the present invention provides activity modulating the time of occurrence of the first salivation.

 Figure 5 shows the results of the pilocarpine model, indicating the time for the first convulsive signal to occur.

[0110] Figure 6 shows the results of pilocarpine model tests, indicating the time for the first seizure to occur. The asterisk ( ^* ) indicates P <0.001 vs Control, Hp 600 μg / kg, Pep19 1000μg / kg.

The results of the tests performed in examples 2 and 3 above show significant and significant in vivo results in dosage ranges of the order of 600 to 1000 μg of compound of the invention per kg of animal. Considering the tests in mice and the conversion to the Equivalent Dose in As discussed above, effects of the same magnitude are expected in humans in the dosage range of 48 to 80 μg of compound of the invention per kg of human and, given the applicable safety ranges, concentrations between 4.8 to 800 μg / kg for administration to humans are considered in the present invention.

 The inventive concept now disclosed and exemplified in one or more forms was treated as an industrial secret and was not previously disclosed until the filing of this patent application. This industrial secret is immaterial asset of the depositor. The possible future publication of the patent application does not in itself constitute authorization for use by third parties, serving only as: (i) scientific knowledge to third parties of the existence of said industrial secret at the time of filing; (ii) unequivocal indication of its holder; and (iii) stimulating the development of new improvements based on the concept disclosed, in order to avoid reinvestment in the development of the same asset already held by the depositor.

 [0113] It is immediately noted that any commercial use requires authorization from the holder and that unauthorized use imposes penalties provided for by law. In this context, it is first clarified that from the disclosure of the present inventive concept, those skilled in the art may consider other embodiments of the invention not identical to those merely exemplified above, but that in the hypothesis of claim to commercial use such forms may be considered to be within the scope of the appended claims.

Claims

Claims 1 . Use of a compound comprising at least 7 amino acids of the formula: R ₁ -N-AA ₁ -K-AA ₂ -R ₂ at where: AAi is an amino acid selected from the group consisting of F, W, L, I, V, P, G; AA ₂ is an amino acid selected from the group consisting of F, W, L, I, V, P, G; Ri is the dipeptide PV, the tripeptide DPV, the tetrapeptide VDPV, or the pentapeptide RVDPV; and R ₂ is the amino acid L, the dipeptide LH, or the tripeptide LSH, and / or modified, cyclic forms thereof, amidated, methylated, PEGylated versions, salts thereof; and / or combinations thereof, characterized in that it is for the preparation of a medicament for the curative or prophylactic treatment of seizures in a mammal. Use according to claim 1 characterized in that AA ₁ and / or AA ₂ is F, W or L.  Use according to claim 1 or 2, characterized in that said compound is selected from the group consisting of: DPVNFKL, DPVNFKF, PVNFKFL PVNFKLL, PVNFKFLS, PVNFKLLS, PVNFKLSH, PVNFKLLSH, VDPVNFKFLSH, RVDPVNFKFLSH, VDPVNFKFLSH, RVDPVNFKLLSH VDPVNFKL , VDPVNFKF, PVNWKFLSH, PVNFKWLSH, PVNWKWLSH, PVNWKFL, PVNFKWL, PVNWKWL, as well as modified, cyclic forms thereof, amidated, methylated, PEGylated versions; their salts; or combinations thereof. A pharmaceutical composition for the curative or prophylactic treatment of seizures in a mammal characterized in that it comprises a pharmaceutically acceptable carrier; and, as active principle, the compound as described in one of claims 1 to 3. Pharmaceutical composition according to claim 4, characterized in that it comprises the nonapeptide PVNFKFLSH, the nonapeptide PVNFKLLSH or combinations thereof.  Pharmaceutical composition according to claim 4 or 5 characterized in that it is in the form of a tablet, gel, oral liquid or syrup, a capsule, a suppository, an injectable solution, an inhalable form or an adhesive. A curative or prophylactic therapeutic method of seizures comprising administering to an animal the compound described in one of claims 1 to 3.